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Discover the ideal sealing solution for medium to large-scale repair projects! Our 3.5mm Cross Section NBR O-Rings offer the perfect balance of thickness and flexibility for demanding applications. Made from premium Nitrile Rubber (Buna-N), these durable seals provide exceptional resistance to oils, fuels, water, and hydraulic fluids, making them a versatile choice for automotive, industrial, and plumbing repairs.
š Perfect Balance: The 3.5mm cross-section provides excellent sealing performance without being too thick or too thin. Ideal for medium-pressure systems and larger diameter applications where both flexibility and durability are required!
| Material | Nitrile Rubber (NBR / Buna-N) ā Excellent resistance to oils, fuels, greases, and hydraulic fluids, perfect for automotive and industrial environments. |
|---|---|
| Cross Section (Thickness) | 3.5mm (0.138") ā Medium thickness that offers a great balance between sealing performance and flexibility for various applications. |
| Outer Diameter (OD) Range | 175mm (6.89") to 370mm (14.57") ā Specifically sized for medium to large applications, including automotive, industrial, and plumbing systems. |
| Hardness (Durometer) | Shore 70A ā Provides optimal sealing force while maintaining good flexibility for installation in various groove designs. |
| Temperature Range | -40Ā°F to +248Ā°F (-40Ā°C to +120Ā°C) ā Suitable for a wide range of operating conditions, from cold environments to hot industrial settings. |
| Key Features | Excellent oil and fuel resistance, good abrasion resistance, water resistance, reliable sealing performance, and versatile application range. |
These versatile 3.5mm O-rings are perfect for numerous medium to large-scale sealing applications:
Yes, absolutely. NBR (Nitrile) rubber is specifically formulated for petroleum-based products. These 3.5mm fuel-resistant O-rings work excellently with gasoline, diesel, motor oil, transmission fluid, and most hydraulic fluids, making them ideal for automotive and industrial fuel systems.
3.5mm O-rings offer a great middle ground. They're thicker than standard 2mm-3mm O-rings for better durability, but not as thick as 5mm or 7mm ones. This makes them perfect for medium-pressure applications where you need good sealing performance without excessive bulk. They're easier to install in some applications than thicker O-rings while still offering solid performance.
Yes. NBR has excellent compatibility with most petroleum-based hydraulic fluids. These 3.5mm hydraulic seals are well-suited for medium-pressure hydraulic systems found in industrial equipment, manufacturing machinery, and automotive applications. They provide reliable sealing for hydraulic fluids within their temperature and pressure ratings.
NBR (Nitrile) offers superior resistance to oils, fuels, and greases. Silicone has better high-temperature resistance but swells in oil. EPDM excels with weather, steam, and coolant, but performs poorly with fuels. For applications involving petroleum products, 3.5mm NBR O-rings are typically the best choice.
We offer both options to meet your needs. You can purchase individual 3.5mm O-ring sizes for specific repair jobs or maintenance tasks. We also offer value kits containing multiple popular sizes from our 175-370mm OD range, perfect for workshops, maintenance departments, or professionals who want versatile sealing solutions on hand.
